Device for applying an embossing to a web of tissue paper

Abstract

An embossing device for embossing a single-ply or multi-ply web of tissue paper includes a first steel roll with embossing protuberances on its peripheral surface and a second roll with a yielding layer on its peripheral surface. The second roll cooperates with the steel roll so as to form an embossing nip therewith. The steel roll and the second roll run in synchronization. The second roll has individual zones on its peripheral surface with a higher overall thickness and/or different material characteristics of the yielding layer compared to that of the remaining peripheral surface. These individual zones are opposed in the embossing nip to embossing protuberances of the steel roll.

What is claimed is:  
     
       1. An embossing device for embossing a single-ply or multi-ply web of tissue paper, comprising: 
       a first roll with embossing protrusions on its peripheral surface; and  
       a second roll with a yielding layer on its peripheral surface cooperably disposed with respect to the first roll as to form an embossing nip therewith;  
       the first roll and the second roll run in synchronization;  
       the second roll has individual zones on its peripheral surface with a higher overall thickness and/or different material characteristics of the yielding layer compared to that of the remaining peripheral surface;  
       wherein the individual zones are generally opposed in the embossing nip to the embossing protrusions of the first roll.  
     
     
       2. The embossing device according to  claim 1 , wherein the first roll has first embossing protrusions forming a graphic pattern and second embossing protrusions forming a background pattern, the height of the first embossing protrusions and the second embossing protrusions being substantially identical. 
     
     
       3. The embossing device according to  claim 1 , wherein the second roll is a rubber coated roll. 
     
     
       4. The embossing device according to  claim 2 , wherein the synchronization of the first roll and the second roll places the individual zones of the second roll opposing the first protrusions. 
     
     
       5. The embossing device according to  claim 1 , wherein the second roll has an additional yielding layer in the individual zones of its peripheral surface. 
     
     
       6. The embossing device according to  claim 5 , wherein the additional yielding layer has a different hardness compared to the yielding layer in the remaining part of the peripheral surface. 
     
     
       7. The embossing device according to  claim 1 , wherein the yielding layer of the individual zones has a different material composition and/or surface treatment compared to the yielding layer of the remaining part of the peripheral surface. 
     
     
       8. The embossing device of  claim 1 , wherein first roll is metal. 
     
     
       9. The embossing device of  claim 1 , wherein first roll is steel. 
     
     
       10. The embossing device according to  claim 2 , wherein the second roll is a rubber coated roll. 
     
     
       11. The embossing device according to  claim 2 , wherein the second roll has an additional yielding layer in the individual zones of its peripheral surface. 
     
     
       12. The embossing device according to  claim 3 , wherein the second roll has an additional yielding layer in the individual zones of its peripheral surface. 
     
     
       13. The embossing device according to  claim 2 , wherein the yielding layer of the individual zones has a different material composition and/or surface treatment compared to the yielding layer of the remaining part of the peripheral surface.